package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    @Transactional
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //得到当前用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //若存在，数量加一
        if(list!=null&&list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.update(cart);
        }else {
            //若不存在，则插入一条新数据
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //本次添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = new Setmeal();
                setmeal.setId(setmealId);
                setmeal = setmealMapper.list(setmeal).get(0);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车中一个商品
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获取商品信息
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart = shoppingCartMapper.list(shoppingCart).get(0);
        Integer number = shoppingCart.getNumber();
        //若商品数量大于1，则减一
        if(number>1){
            shoppingCart.setNumber(number-1);
            shoppingCartMapper.update(shoppingCart);
        }else {
            //若商品数量等于1，则删除
            shoppingCartMapper.deleteById(shoppingCart.getId());
        }
    }
}
